# -*- coding: utf-8 -*-
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# to you under the Apache License, Version 2.0 (the
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#
# http://www.apache.org/licenses/LICENSE-2.0
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import azure.cosmos.cosmos_client as cosmos_client
from azure.cosmos.errors import HTTPFailure
import uuid
from airflow.exceptions import AirflowBadRequest
from airflow.hooks.base_hook import BaseHook
[docs]class AzureCosmosDBHook(BaseHook):
"""
Interacts with Azure CosmosDB.
login should be the endpoint uri, password should be the master key
optionally, you can use the following extras to default these values
{"database_name": "<DATABASE_NAME>", "collection_name": "COLLECTION_NAME"}.
:param azure_cosmos_conn_id: Reference to the Azure CosmosDB connection.
:type azure_cosmos_conn_id: str
"""
def __init__(self, azure_cosmos_conn_id='azure_cosmos_default'):
self.conn_id = azure_cosmos_conn_id
self.connection = self.get_connection(self.conn_id)
self.extras = self.connection.extra_dejson
self.endpoint_uri = self.connection.login
self.master_key = self.connection.password
self.default_database_name = self.extras.get('database_name')
self.default_collection_name = self.extras.get('collection_name')
self.cosmos_client = None
[docs] def get_conn(self):
"""
Return a cosmos db client.
"""
if self.cosmos_client is not None:
return self.cosmos_client
# Initialize the Python Azure Cosmos DB client
self.cosmos_client = cosmos_client.CosmosClient(self.endpoint_uri, {'masterKey': self.master_key})
return self.cosmos_client
[docs] def __get_database_name(self, database_name=None):
db_name = database_name
if db_name is None:
db_name = self.default_database_name
if db_name is None:
raise AirflowBadRequest("Database name must be specified")
return db_name
[docs] def __get_collection_name(self, collection_name=None):
coll_name = collection_name
if coll_name is None:
coll_name = self.default_collection_name
if coll_name is None:
raise AirflowBadRequest("Collection name must be specified")
return coll_name
[docs] def does_collection_exist(self, collection_name, database_name=None):
"""
Checks if a collection exists in CosmosDB.
"""
if collection_name is None:
raise AirflowBadRequest("Collection name cannot be None.")
existing_container = list(self.get_conn().QueryContainers(
get_database_link(self.__get_database_name(database_name)), {
"query": "SELECT * FROM r WHERE r.id=@id",
"parameters": [
{"name": "@id", "value": collection_name}
]
}))
if len(existing_container) == 0:
return False
return True
[docs] def create_collection(self, collection_name, database_name=None):
"""
Creates a new collection in the CosmosDB database.
"""
if collection_name is None:
raise AirflowBadRequest("Collection name cannot be None.")
# We need to check to see if this container already exists so we don't try
# to create it twice
existing_container = list(self.get_conn().QueryContainers(
get_database_link(self.__get_database_name(database_name)), {
"query": "SELECT * FROM r WHERE r.id=@id",
"parameters": [
{"name": "@id", "value": collection_name}
]
}))
# Only create if we did not find it already existing
if len(existing_container) == 0:
self.get_conn().CreateContainer(
get_database_link(self.__get_database_name(database_name)),
{"id": collection_name})
[docs] def does_database_exist(self, database_name):
"""
Checks if a database exists in CosmosDB.
"""
if database_name is None:
raise AirflowBadRequest("Database name cannot be None.")
existing_database = list(self.get_conn().QueryDatabases({
"query": "SELECT * FROM r WHERE r.id=@id",
"parameters": [
{"name": "@id", "value": database_name}
]
}))
if len(existing_database) == 0:
return False
return True
[docs] def create_database(self, database_name):
"""
Creates a new database in CosmosDB.
"""
if database_name is None:
raise AirflowBadRequest("Database name cannot be None.")
# We need to check to see if this database already exists so we don't try
# to create it twice
existing_database = list(self.get_conn().QueryDatabases({
"query": "SELECT * FROM r WHERE r.id=@id",
"parameters": [
{"name": "@id", "value": database_name}
]
}))
# Only create if we did not find it already existing
if len(existing_database) == 0:
self.get_conn().CreateDatabase({"id": database_name})
[docs] def delete_database(self, database_name):
"""
Deletes an existing database in CosmosDB.
"""
if database_name is None:
raise AirflowBadRequest("Database name cannot be None.")
self.get_conn().DeleteDatabase(get_database_link(database_name))
[docs] def delete_collection(self, collection_name, database_name=None):
"""
Deletes an existing collection in the CosmosDB database.
"""
if collection_name is None:
raise AirflowBadRequest("Collection name cannot be None.")
self.get_conn().DeleteContainer(
get_collection_link(self.__get_database_name(database_name), collection_name))
[docs] def upsert_document(self, document, database_name=None, collection_name=None, document_id=None):
"""
Inserts a new document (or updates an existing one) into an existing
collection in the CosmosDB database.
"""
# Assign unique ID if one isn't provided
if document_id is None:
document_id = str(uuid.uuid4())
if document is None:
raise AirflowBadRequest("You cannot insert a None document")
# Add document id if isn't found
if 'id' in document:
if document['id'] is None:
document['id'] = document_id
else:
document['id'] = document_id
created_document = self.get_conn().CreateItem(
get_collection_link(
self.__get_database_name(database_name),
self.__get_collection_name(collection_name)),
document)
return created_document
[docs] def insert_documents(self, documents, database_name=None, collection_name=None):
"""
Insert a list of new documents into an existing collection in the CosmosDB database.
"""
if documents is None:
raise AirflowBadRequest("You cannot insert empty documents")
created_documents = []
for single_document in documents:
created_documents.append(
self.get_conn().CreateItem(
get_collection_link(
self.__get_database_name(database_name),
self.__get_collection_name(collection_name)),
single_document))
return created_documents
[docs] def delete_document(self, document_id, database_name=None, collection_name=None):
"""
Delete an existing document out of a collection in the CosmosDB database.
"""
if document_id is None:
raise AirflowBadRequest("Cannot delete a document without an id")
self.get_conn().DeleteItem(
get_document_link(
self.__get_database_name(database_name),
self.__get_collection_name(collection_name),
document_id))
[docs] def get_document(self, document_id, database_name=None, collection_name=None):
"""
Get a document from an existing collection in the CosmosDB database.
"""
if document_id is None:
raise AirflowBadRequest("Cannot get a document without an id")
try:
return self.get_conn().ReadItem(
get_document_link(
self.__get_database_name(database_name),
self.__get_collection_name(collection_name),
document_id))
except HTTPFailure:
return None
[docs] def get_documents(self, sql_string, database_name=None, collection_name=None, partition_key=None):
"""
Get a list of documents from an existing collection in the CosmosDB database via SQL query.
"""
if sql_string is None:
raise AirflowBadRequest("SQL query string cannot be None")
# Query them in SQL
query = {'query': sql_string}
try:
result_iterable = self.get_conn().QueryItems(
get_collection_link(
self.__get_database_name(database_name),
self.__get_collection_name(collection_name)),
query,
partition_key)
return list(result_iterable)
except HTTPFailure:
return None
[docs]def get_database_link(database_id):
return "dbs/" + database_id
[docs]def get_collection_link(database_id, collection_id):
return get_database_link(database_id) + "/colls/" + collection_id
[docs]def get_document_link(database_id, collection_id, document_id):
return get_collection_link(database_id, collection_id) + "/docs/" + document_id